project: Initial commit

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 68 insertions, 0 deletions

diff --git a/sys/include/arch/amd64/idt.h b/sys/include/arch/amd64/idt.h
new file mode 100644
index 0000000..7f439f3
--- /dev/null
+++ b/sys/include/arch/amd64/idt.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _MACHINE_IDT_H_
+#define _MACHINE_IDT_H_
+
+#include <sys/types.h>
+#include <sys/cdefs.h>
+
+#define IDT_TRAP_GATE       0x8F
+#define IDT_INT_GATE        0x8E
+#define IDT_USER_INT_GATE   0xEE
+
+#define ISR(p) ((uintptr_t)p)
+
+/*
+ * AMD64 Interrupt Gate Descriptor.
+ */
+struct idt_entry {
+    uint16_t    off_lo;         /* Low 16 bits of ISR offset */
+    uint16_t    segsel;         /* Segment selector, hardcode to kernel CS */
+    uint8_t     ist    : 2;     /* Interrupt stack table */
+    uint8_t     zero   : 1;     /* Unused: keep zero */
+    uint8_t     zero1  : 4;     /* Unused: keep zero */
+    uint8_t     type   : 4;     /* Gate type */
+    uint8_t     zero2  : 1;     /* Unused: keep zero */
+    uint8_t     dpl    : 2;     /* Descriptor privilege level */
+    uint8_t     p      : 1;     /* Present (keep 1 to mark as valid) */
+    uint16_t    off_mid;        /* Middle 16 bits of ISR offset */
+    uint32_t    off_hi;         /* High 32-bits of ISR offset */
+    uint32_t    reserved;       /* Reserved: keep zero */
+};
+
+struct __packed idtr {
+    uint16_t limit;
+    uintptr_t offset;
+};
+
+void idt_set_desc(uint8_t vector, uint8_t type, uintptr_t isr, uint8_t ist);
+void idt_load(void);
+
+#endif  /* !_MACHINE_IDT_H_ */